Xantphite: A New Family of Ligands for Catalysis. Applications in the Hydroformylation of Alkenes
作者:Cedric B. Dieleman、Paul C. J. Kamer、Joost N. H. Reek、Piet W. N. M. van Leeuwen
DOI:10.1002/1522-2675(20011017)84:10<3269::aid-hlca3269>3.0.co;2-g
日期:2001.10.17
The novel bulky diphosphite (P∩P) ligands (3 and 4) based on the 2,7,9,9-tetramethyl-9H-xanthene-4,5-diol (2) backbone were investigated in the Rh-catalyzed hydroformylation of oct-1-ene, styrene, and (E)-oct-2-ene. These diphosphites gave rise to very active and selective catalysts for the hydroformylation of oct-1-ene to nonanal with average rates>10000 (mol aldehyde)(mol Rh)−1h−1 (P(CO/H2)=20 bar
基于 2,7,9,9-四甲基-9H-xanthene-4,5-二醇 (2) 骨架的新型大体积二亚磷酸酯 (P∩P) 配体 (3 和 4) 在 Rh 催化的加氢甲酰化反应中进行了研究oct-1-ene、苯乙烯和 (E)-oct-2-ene。这些二亚磷酸酯产生了非常活跃和选择性的催化剂,用于将辛-1-烯加氢甲酰化为壬醛,平均速率>10000 (mol 醛)(mol Rh)-1h-1 (P(CO/H2)=20 bar, T =80°,[Rh]=1 mM),线性产物的最大选择性为 79%。对直链醛的选择性相对较高(高达 70%,直链/支链高达 2.3),但在苯乙烯的加氢甲酰化反应中观察到非常高的活性(高达 39000 (mol 醛)(mol Rh)-1h-1)这些双齿配体的存在 (P(CO/H2)=2 – 10 bar, T=120°, [Rh]=0.2 mM)。使用这些二亚磷酸酯实现 (E)-oct-2-ene